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use std::str::FromStr; use ErrorKind; /// Supported commands. pub enum Command { /// A default command "s". S, /// An empty command, same as `Command::S`. Empty, } impl FromStr for Command { type Err = ErrorKind; fn from_str(s: &str) -> Result<Self, Self::Err> { match s { "" => Ok(Command::Empty), "s" => Ok(Command::S), cmd => Err(ErrorKind::UnknownCommand(cmd.into())), } } }